vital.vim/doc/vital/Random/Mt19937ar.txt at master · vim-jp/vital.vim · GitHub

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*vital/Random/Mt19937ar.txt*	random number generator using mt19937ar

Maintainer: Linda_pp  <lin90162@gmail.com>

==============================================================================
CONTENTS					*Vital.Random.Mt19937ar-contents*

INTRODUCTION			|Vital.Random.Mt19937ar-introduction|
INTERFACE			|Vital.Random.Mt19937ar-interface|
  FUNCTIONS			|Vital.Random.Mt19937ar-functions|


==============================================================================
INTRODUCTION				*Vital.Random.Mt19937ar-introduction*

*Vital.Random.Mt19937ar* provides a Random Number Generator (RNG) using Mersenne
Twister algorithm.  Random numbers generated by mt19937ar have very long period
and high order of equidistribution.

http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html

The algorithm was ported to Vim script by Yukihiro Nakadaira and this module is
imported from the implementation.

https://github.com/ynkdir/vim-funlib/blob/master/autoload/random/mt19937ar.vim

This implementation always generates 32bit number [-2147483648, 2147483647],
even when you use Vim with |+num64|.

>
	let s:V = vital#{plugin-name}#new()
	let s:M = s:V.import("Random.Mt19937ar")

	call s:M.srand(1)
	echo s:M.rand()
	" 1067595299
	echo s:M.rand()
	" 955945823
	call s:M.srand(1)
	echo s:M.rand()
	" 1067595299
<


==============================================================================
INTERFACE				*Vital.Random.Mt19937ar-interface*

------------------------------------------------------------------------------
FUNCTIONS				*Vital.Random.Mt19937ar-functions*

srand([{seed}])				*Vital.Random.Mt19937ar.srand()*
	Set a seed of generator.  When {seed} is omitted, a return value of
	|reltime()| is used.  When {seed} is omitted and vim doesn't have
	|reltime()|, a return value of |localtime()| is used.  The seed is a
	number.

rand()					*Vital.Random.Mt19937ar.rand()*
	Generate a random number.
	Note: A return value is possibly negative.  This is because Vim script
	doesn't have an unsigned integer type.

new_generator()				*Vital.Random.Mt19937ar.new_generator()*
	Create a new Generator object(|Vital.Random.Mt19937ar-Generator|).


==============================================================================
OBJECTS					*Vital.Random.Mt19937ar-objects*

------------------------------------------------------------------------------
Generator Object		*Vital.Random.Mt19937ar-Generator*

Generator.next()		*Vital.Random.Mt19937ar-Generator.next()*
	Get the next random number in the sequence.

Generator.min()			*Vital.Random.Mt19937ar-Generator.min()*
	Get the smallest possible value in the output range.

Generator.max()			*Vital.Random.Mt19937ar-Generator.max()*
	Get the largest possible value in the output range.

Generator.seed({seeds})		*Vital.Random.Mt19937ar-Generator.seed()*
	Set seeds by array of numbers which initializes the generator.  The
	size of the array is arbitrary.


==============================================================================
vim:tw=78:fo=tcq2mM:ts=8:ft=help:norl